js取指定范围随机值【原】

时间：2023-01-24 15:06:02

js取指定范围随机值

<HTML>

<HEAD>

<meta http-equiv="content-Type"content="text/html;nameset=utf-8">

<TITLE>取指定范围随机数</TITLE>

<script type="text/javascript">

var names = ['A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'];

 /* min<=取值<=max*/

function GetRandomNum(min,max)

{

    var Range = max - min;

    var Rand = Math.random();

    return (min + Math.round(Rand * Range));

}   

function getResult(){

    var length = names.length-1;

    var index = GetRandomNum(0,length);

    alert(names[index]);

}

</script>

</HEAD>

<BODY>

<button onclick="getResult()"> 随机取数</button>

</BODY>

</HTML>

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